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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b96fd9b407c7327c484f9ceefe015ac980be16bc8dcdf06a7894bdc3ca9bbd5' 
  AND token = 'nweip1BEu9//tBXxXb1TXM+gLVyWQEIkWgBvFb7pFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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