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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89958c3ecd0523c45bd82cdd22f3ae519c65e7fb98b46a50523cbf85c959dd9' 
  AND token = 'kEXMaWEQcC0crLH3Rz7HorgHZHZzcfForF18tbjuNO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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