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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e80c8f612f9a0e3ae4f7d6de83adecf4c44a4bb369803618686313f0cd38796' 
  AND token = '/Utdm6KcFsExIU5GT9MIcYGJI47AHkhEIiE2NS2jF8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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