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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f9bfaa9782e2d86a4dcf264753223c308fd7c4785ec8c226cd617622ac43a0' 
  AND token = 'YWkQn+gogsnC+IWINd/jlFXcb/bfN6pFFYk7lzjwehg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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