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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a3ce8648c7b003e5b790368184421549674fa1e8b0c4436ccc5a28e1f6c284' 
  AND token = '9xpkRnbWRYpHs3Lc+ZBMGQhWk2bHj+diNM8qT7s+M7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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