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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e091689c4a0be81f869dba5b63895e3a785192751da30e692e55a77234b4e8b7' 
  AND token = 'sZbCw8tHPWPVGKFa6rwlarF18e6v08hR3zhyi8eu5oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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