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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7163c3f05be68c77db7cc47df9ac5d5e7133e6b3fee1c7a7dd691e661cdb54b1' 
  AND token = 've6YC+W3Yl8OJ0Cr1pZS9MYBdhxNc9og7ajPKPOSf9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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