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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86249d5b25f9b48033ef9415ec9374687bbe61ae0b0e0c0b6e65728bd39f36c' 
  AND token = '9ZZBMCHB4nF78u+9yso8Zw9ZYP6ttnFI9cq9Hmow4IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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