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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0660d1f4ef5d0a91318a18294191cc56eb8f8d77b771738c98837be8f0251a55' 
  AND token = '1LL+sx+B9ljvx7MOX26FqjVePAzN0cBeO7ztpSMQuGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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