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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a29e9f40553e8b10a73fa5c6b357713adc061de60a459db238b8dcb2438415' 
  AND token = '1hpT/Y5ff4GeVNRCoV3354bV0nNc86/CLQyjvvcpL/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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