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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9411bc92d742dcab8b04104539cf06a5078f9783f66d62fabd44fcd1a849ce43' 
  AND token = 'wNvGba7/APYgJz2EyXmdzad3vdNH3CBcP6H2NeCmHQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}