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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f32ba98027b4762b5ac50d055449a5f4e511a796b5f3fb3a3594bd727f93cbc' 
  AND token = 'Kxxdt1RmOHgrfuahyzGJxPDuK9ojPmjNZ3VEduhrx1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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