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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fec0b816fae0e6a92cc1c4a404b246346184c3740f5a74199913413ba042355' 
  AND token = 'V7bI7BeWBWTRPbi0murcuNcQWmqYwdr/Eobd/TKb550=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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