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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09661eafdc175c38c4f2b24baaff7eeaf696ecd6c031b9bda3c2b8a119fada9' 
  AND token = 'MezcqGp8pFhR5V7KQl1TD8T1ORMWpT5zo+sYN6Z7IDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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