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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1111d98eb4ac8e46a3cb0945cd4f8fdb49f4b040143d4c02a464b22e611c38a9' 
  AND token = '2DVb/M8PMbjI0QMsNn8hidG8mbajtBnon2iprHRYjMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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