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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e1618bc294d83c91424c639486e1734547ac262cc2b2c8ae839a3c73fe4dae' 
  AND token = 'nnZuhb9zNL7TRtq7MehG4hWxYe0ym/9zveMBVj+8myY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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