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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb09e7ebff96e60aa3fa85ccd0610b58d2c2096cb5ac059e42285eaff41813d' 
  AND token = 'p34N1snBFjS5hhIkjrAak3W8PE2ccM5pWQjrYE+YN7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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