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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a239679fec3f048f662d3c19a4dd468d9a14c086b3bf40315bb1041f0f41cb1d' 
  AND token = 'ArHQhHcmg39/620wJ9hYA7E3Db6yX6dMiVJG/Sr1qI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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