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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197b77eb272c7aa14b52e79c36f61974e2566eddb427fe7b7ec4406e02a15788' 
  AND token = 'oEoF+lTWUPNTXwEzJtpj8Lfq0DOrQ0cljm4+8shDTfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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