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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07d2c0ff44548229262d9c51ddbd8302824b3dd39c9c05846d58a2ed1aee41b' 
  AND token = 'aCp27NWBDiIEUd8oFMJ4lzj2mudjJoyRAbfmnT2QC5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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