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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9b6d57a8a65cccfb313c8791f8a7f8960a78592460c5af95ec78c077a71584' 
  AND token = 'F8YDxYfJKXKXuDQ27jbQ0m5kPs+0lQ1rmNYhKiq+1+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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