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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3ed36d209b3c83486b9e23648766fc3d0389554a6b7c4ee6aaadcdf1fbb486' 
  AND token = 'hyYrBspdW180p36QN3H5yt+U98vidW3fRkRzglgbJKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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