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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1854acbba8ea3d958aea4b6fa8e9baf6f1906f87816dd29dcb40e71f1c80f0' 
  AND token = '6RSlasQSYH1Eq0XyYDoSJlWfXCqloOzKppac4fwGmss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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