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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203e471a35c06896955e3c0558d74e430bec214b668a7821faf4ba0b5006ebfb' 
  AND token = 'e0gUCnU3Q5TtmqIS8IgYlixj5gXG8yBeFa0IUisE04g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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