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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb51b10f868e5c603ebc3e6174ac2dd1ae44a908c6ead5818aa35595d98ebc3' 
  AND token = 'ERkxXl94H9Oe11nhIsoPOxXiFwY6M5TZJKI+QcMPoFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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