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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c0f91097687ad6573e4ec009e15b853b927553e9812ed810e6b6658f987ca9' 
  AND token = 'krkcvixUw6AKd3zRWIDdiFmcu3uEXe47qQWVz+ieHfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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