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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937a50b38d5719cfc19ea4b36ac233b3ec9108f2fc1b3a668377590d0f157cb6' 
  AND token = 'ntEl9V9ACN3Q/cOHT2CV4BYAtANAnzVrVzAMJBEHP1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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