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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d4069658b859bb8ff7891b4faf65739205cfc99c259385cb206dbdb522a3c1' 
  AND token = '3qaoIuMMYjMmNNErtrqJO46j0xtCs6E1rm5fMT97glk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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