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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47dc4749a9a81718a646a95e2cc18c0af4d0162e8f89a5352fc29792293b7b1' 
  AND token = 'lTFDPiCu0ACDCxEVJQmWfboZhthA9+ChqoPU0/qMX4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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