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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55649521a7f9697bf307f7a94e6ac163bf8d42d1001f1009ece19033f316d61c' 
  AND token = 'm8RvTXFueM5O0R+lcRgPNbxNogADpLszBOsF8ryJZYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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