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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ced4b23e7021e026d1557b01f38dc5d608860c1f64277fa682ef8fe42b07b31' 
  AND token = '76H6mlLuEZZMosY/feSekE+Yg88/+z9UscWKQgiWto8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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