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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9788e236fd8a936d8e15e834bd11268b7b90a80a3ce57e50cfee0611d09dac' 
  AND token = '1+YNlQhnP0svqdtf2u+IMHY4iWOBgYCOzohojssNx+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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