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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452d062d745cdb7088b238ee7ade32ac628620671fc6b90237a5710169c38fe5' 
  AND token = 's+wTyq2lF2ixa9ZseQF57+moJGjzlHb2unFZMwp+BBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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