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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d52f132fedf7243300249133f11e975e2cca313b6b1c4fff44e6ced422d7ae0' 
  AND token = 'PHyCwkTGQNcjzqh6FQSyt9NG56V0KdSOE94MvGtzA6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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