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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdc93212080a40355a8823c225735444349d5fc1ecca750c222af11f1f81071' 
  AND token = 'lqDbGp6KBxF5TuhBafn1SpU3opEGzHik3OEQ5J+1BFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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