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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfcd5ddd329ca43e6fe033126d84942a13e5d693bfb294b1f4382a41adc7380' 
  AND token = '6q7X+Nzl2rbItZSVZO9pqJf+6xODa8iFzuDaMZauFyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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