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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45b6cbb234b208ff93f609c300234945b6f972559577cb7f2098700c8410760' 
  AND token = 'HP3i9gLTyRppzahEKPcJ+o4//XengVl7+wQh0NqONec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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