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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1401ccb1b89d66f62d14c9963b601d7555d0d9db0745fa7218444326239f784' 
  AND token = 'BynvtUAv4zd2r7jK+dj3Tx7A3r6n0y0yOaqpPCxD0fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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