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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbd9cf264df7407f0f4782a71053a8d31bb8cd6a785303f265cce2258d3ac37' 
  AND token = 'o7aoWTvUhEb8rk9Qv7IaOATxK7meP1RqkKvbQqutlwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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