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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf64c4821414ffc4ba6a70b914ff778170c532ccb627eed90d53080c9ebab12a' 
  AND token = 't23w384Gsv83uOd3IO1NGNzqvhTM56OfQcAruRhcmGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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