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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14863b89935b474d2f6c4561c960bc4830218d4d510b32f331c9cb9778a513a8' 
  AND token = 'ONZYYTSefv4aFpWlbnxk7B3oz2BM+yw2q+0RqxwAwg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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