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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c59094ffd7f58ed307e4ee3b87339402546b798893b9a234d140f47634674b5' 
  AND token = 'IUINYmNM7dGm6HIu3sJD8Gg/2JaD+enCnWO6nqieJ9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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