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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13532a7e494e39ca1dedd2fbf9e98e907d81e7a3151d95984efb62d382cf7096' 
  AND token = 'pRBtJTprNYhf7Jwm2SC6iuaKh4wPIdXa51HXtiokzDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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