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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032dd72bba1591d0320d0df446ab62fba74f106dd332044e15b3e795d7cfee74' 
  AND token = 'ZCQzd6vrvJdDJrOS4osiCETqtnlLRLUwfloOo7aqxas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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