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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e12e37ed2ab4c84a957fe355e26997c7d0d1e4f05ad75157ef9952968cd1f23' 
  AND token = '17eRy5l9D1+qeqgRXZxkRO9P5eVdxe7ARHHAhrdOReE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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