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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e978cb16b9ab7398c7d8966f46003c9e5c7c0b20876862e83cf73c35d3b659dc' 
  AND token = '84r0MbxF5EP6mCzH3oT6CSHg6T13iDo1zOtzQyv1pJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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