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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cb3718ff2feee854ad92e35bef9e8947be80431885e2f52fbd2956fe62b788' 
  AND token = 'ro30MHOul6qc+/4ONMdaE2TXa4KjR7dIRUWDHqKjfRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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