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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20568ec79e4173fb767e671ea0c64ba48e0811d1a7da32d7356f68fbb4a8d08' 
  AND token = 'BYXlcL7yRk4etx8cnQS4gv0oQ86VIdWKCiSB3pltQdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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