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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7138bfa248a16969cabea6f2a9ec905b9bb4d9f6d9428337b0eac997fb2a08db' 
  AND token = 'AJgO1ZaHWEItSAzRBLoC0WPAeo2NUW5bnMg3a2Y9Dzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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