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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5eb75839224ba10b682fe32f2a04d151f66f892ac88e159996d737256cfe0d' 
  AND token = 'QaLbzEcDlTGZiR2U0v7B1O9zYOWQpASnjAE+bqrt16Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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