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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a793108ffc1eeebb75e8ad858533a8d6b8c31439850730ea218438795d53b6b8' 
  AND token = '1qnq+kqx3JIeop7hjdmynwO8i9HZxEnXTRrHZwqK/xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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