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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad2de26866b7b63712fe53f877390e93121ef776dab9a7c52ecebf558ec03f8' 
  AND token = '0KT+pb7YpxeJKMBO7WyQ0jCKe4djsw/m3ln2nhVVh0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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