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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfaaa23f6fa295aca0aa02711c1b6bddd7905134d636e56c18fe92e19a59b3ae' 
  AND token = 'gN2DGZ8dkoFiKjjHtgSwmmbEWXrjlSRcgYbCJVEEBtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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