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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432804a22dcb04f91ba01ca1547c0bb80bd381574fc1e1deb40d2426ba7658a4' 
  AND token = 'sOdlR1IZo2xZ0m0f0hHMBOsw7UHXhI0jYKFM6HdUKoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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