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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9aa9c8cc84b6d1fe97eeab905161c2379a806e9c4c345dbabe87a9f6bb16fa3' 
  AND token = '+aw0iNs5D0jBykYQTIxksx+6TqRlqI8FDYDTASsPEC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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