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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec5fadeba7701baf678b724e8f4f4f5dbd99550f3facb64fbcc6392cfda0c71' 
  AND token = 'FPssrTmQ9cHlFhkyTDUvYfpQn0XawSJ/xLVNAybH8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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