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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b93d570087bc1a8020c668a99311596b0a784ea9056b04b753253bba26c90b2' 
  AND token = 'w2OLybS9gmVUwuuEDccGclt8XEGwOwGJw0jobEXhtbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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