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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86bbdf45d6285dc7dfb1cd91391e87d55f40c3ffd8fbe7d37e97bee1c83b3bf' 
  AND token = 'xGC+xZGdBCFvl0QfFeaMUcsJ6kJnzSoTwfV4IFQh53c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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