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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1beafc0e799945994d5708ec4d61134bc92ade2f48a8fdc7f710b40c2674cc8e' 
  AND token = 'z4js3VeY0cVnkaofFY8OkraKrKIGS0RydiIiXceBESo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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