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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c1ac5617ba6ea6b7d1c27a7eafedb9ed68d3f3b81431bae776ec9b57ccd30c6' 
  AND token = 'psbMb/iIC8/cwR8KzgTR7IUQkisvIt8p3wtKRfUM4BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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