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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea673e96b8da1d07f8729ff4e8ef645828e2c1dcc7e3d7ef6196ccf9ff8211f' 
  AND token = 'kR4p7LEj1boC+y/d+VoxHf19fOhYCqVS11lkM/l/wkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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