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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24feb5c356be37945092964859952d005ea2b3cc41580ace735916c643b6bd6e' 
  AND token = 't6hptoPNPeZfZ0LlCHnUUV0bBaiLFlG9uuEi8d3+WlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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