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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534dcba8b9548806c1f5c8a4bdd327707cbc50f8aa6b1760c2d69a0231acf7dd' 
  AND token = 'ZVnR20hd2P2+41ne8Fk7rHV0s9bcsSAfiL9hHHBJPyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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