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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f23b03d69e0d50f270b4a1e5e003b285cab5a2979c547b2e8a339682f794a9' 
  AND token = '8D0RyTHGpQsoZbRFjcZUD19p6w7pXNa167+P+xop/oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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