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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f30da1fbac95122acef7753ab86def4e3183c22cfb649b196906cf88d2593f' 
  AND token = '3ym1FdlL/O3rQxEzqzJ6F8AdGxOKRsxY7HUP6HuaxEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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