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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e99e64987f2a5f1093edbc2ff636c9c28681b6e458838ef7312a76c1b6722a' 
  AND token = 'afwLaTvRatQxsWuN7BRLyx/fy3u2ANE3jRGjZnx9bk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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